Do they speak English in What?

Paul,

In my letter, the one to which you're responding, I've answered most of your questions. The rest of your questions, every one of them, is answered in the other letter I sent which you received.

Why is it impossible for you to look down or over to my previous ramblings, and from them extract the obvious answer to your questions? When I say, 6 times, 12, I really do mean 12. Not 11, even if you want it to be so. Yes, I know, your program code thinks it only does 11, and you have only used 11, but really it used to work with 12 rather a lot. I depend on 12, and so do a few other people.

Please, understand that some people use 12. Okay? Can we accept that and move on to looking into why it no longer accepts 12? If I'm to use your program, I really need it to do 12.

Not 11. Okay? No, really: not 11; 12.

Do you speak English? I know you're American, but I don't speak American except for what I've learned from your lovely television programmes.

(the situation described herein has been simplified for easier consumption)